Polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of a precious metal catalyst, and discloses a polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst as well as a preparation method and application thereof, wherein the catalyst is that platinum nanoparticles are uniformly dispersed on the surface of a polycarboxyl magnetic silicon nanosphere carrier; the preparation method adopts a nano ferrosoferric oxide magnetic sphere as a core; the nano ferrosoferric oxide magnetic silicon sphere is prepared by coating silicon dioxide by a sol-gel method, and carboxyl functionalization is performed to obtain a polycarboxyl magnetic silicon nanosphere carrier, and then the metal platinum is immobilized to obtain the polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst. A cheap and easily available material is adopted as an immobilizing material, phosphorus or sulfur is not involved in the preparation process, and the polycarboxyl magnetic silicon nanosphere immobilizedplatinum catalyst is prepared which has high activity, selectivity and reusability and is successfully applied to hydrosilylation between n-hexene, n-heptylene, n-octylene, trans-2-hexene, cis-2-hexene, trans-3-hexene, cis-3-hexene and dichloromethylsilane.

Description

technical field [0001] The invention belongs to the technical field of noble metal catalysts, and in particular relates to a nano-material immobilized noble metal platinum catalyst compatible with magnetism and easy separation, as well as its preparation method and application. Background technique [0002] Precious metal catalysts play a very important role in the development of today's society. According to their use forms, they can be divided into homogeneous catalysts and heterogeneous catalysts. Among them, heterogeneous catalysts, that is, supported metal catalysts, can be recycled because they are easy to separate from the liquid reaction system. , is widely used in the production of medicine, pesticide, fine chemical industry, seasoning, fragrance and health care products in industry [1-3] . With magnetic ferric oxide (Fe 3 o 4 ) is a carrier of noble metal catalysts, which is a magnetic material with specific particle size and superparamagnetism, and has been use...

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Problems solved by technology

[0004] However, the catalytic systems widely used in industry are platinum complexes and supports, and most of them have three main disadvantages: first, the metal platinum is expensive, and the catalyst metal platinum is easy to fall off and difficult to recycle; second, the recycling rate of the catalyst is low. The third is that the catalytic activity is not high, there are many by-products and the catalyst and the reaction system cannot be effectively separated completely [11,12] , so the catalytic system must be fundamentally changed to increase the utilization of platinum metal, make its recovery simple and expand the application range of hydrosilylation

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